1 // SPDX-License-Identifier: GPL-2.0 2 #include <test_progs.h> 3 #include <bpf/btf.h> 4 5 static int duration = 0; 6 7 void btf_dump_printf(void *ctx, const char *fmt, va_list args) 8 { 9 vfprintf(ctx, fmt, args); 10 } 11 12 static struct btf_dump_test_case { 13 const char *name; 14 const char *file; 15 bool known_ptr_sz; 16 struct btf_dump_opts opts; 17 } btf_dump_test_cases[] = { 18 {"btf_dump: syntax", "btf_dump_test_case_syntax", true, {}}, 19 {"btf_dump: ordering", "btf_dump_test_case_ordering", false, {}}, 20 {"btf_dump: padding", "btf_dump_test_case_padding", true, {}}, 21 {"btf_dump: packing", "btf_dump_test_case_packing", true, {}}, 22 {"btf_dump: bitfields", "btf_dump_test_case_bitfields", true, {}}, 23 {"btf_dump: multidim", "btf_dump_test_case_multidim", false, {}}, 24 {"btf_dump: namespacing", "btf_dump_test_case_namespacing", false, {}}, 25 }; 26 27 static int btf_dump_all_types(const struct btf *btf, 28 const struct btf_dump_opts *opts) 29 { 30 size_t type_cnt = btf__get_nr_types(btf); 31 struct btf_dump *d; 32 int err = 0, id; 33 34 d = btf_dump__new(btf, NULL, opts, btf_dump_printf); 35 if (IS_ERR(d)) 36 return PTR_ERR(d); 37 38 for (id = 1; id <= type_cnt; id++) { 39 err = btf_dump__dump_type(d, id); 40 if (err) 41 goto done; 42 } 43 44 done: 45 btf_dump__free(d); 46 return err; 47 } 48 49 static int test_btf_dump_case(int n, struct btf_dump_test_case *t) 50 { 51 char test_file[256], out_file[256], diff_cmd[1024]; 52 struct btf *btf = NULL; 53 int err = 0, fd = -1; 54 FILE *f = NULL; 55 56 snprintf(test_file, sizeof(test_file), "%s.o", t->file); 57 58 btf = btf__parse_elf(test_file, NULL); 59 if (CHECK(IS_ERR(btf), "btf_parse_elf", 60 "failed to load test BTF: %ld\n", PTR_ERR(btf))) { 61 err = -PTR_ERR(btf); 62 btf = NULL; 63 goto done; 64 } 65 66 /* tests with t->known_ptr_sz have no "long" or "unsigned long" type, 67 * so it's impossible to determine correct pointer size; but if they 68 * do, it should be 8 regardless of host architecture, becaues BPF 69 * target is always 64-bit 70 */ 71 if (!t->known_ptr_sz) { 72 btf__set_pointer_size(btf, 8); 73 } else { 74 CHECK(btf__pointer_size(btf) != 8, "ptr_sz", "exp %d, got %zu\n", 75 8, btf__pointer_size(btf)); 76 } 77 78 snprintf(out_file, sizeof(out_file), "/tmp/%s.output.XXXXXX", t->file); 79 fd = mkstemp(out_file); 80 if (CHECK(fd < 0, "create_tmp", "failed to create file: %d\n", fd)) { 81 err = fd; 82 goto done; 83 } 84 f = fdopen(fd, "w"); 85 if (CHECK(f == NULL, "open_tmp", "failed to open file: %s(%d)\n", 86 strerror(errno), errno)) { 87 close(fd); 88 goto done; 89 } 90 91 t->opts.ctx = f; 92 err = btf_dump_all_types(btf, &t->opts); 93 fclose(f); 94 close(fd); 95 if (CHECK(err, "btf_dump", "failure during C dumping: %d\n", err)) { 96 goto done; 97 } 98 99 snprintf(test_file, sizeof(test_file), "progs/%s.c", t->file); 100 if (access(test_file, R_OK) == -1) 101 /* 102 * When the test is run with O=, kselftest copies TEST_FILES 103 * without preserving the directory structure. 104 */ 105 snprintf(test_file, sizeof(test_file), "%s.c", t->file); 106 /* 107 * Diff test output and expected test output, contained between 108 * START-EXPECTED-OUTPUT and END-EXPECTED-OUTPUT lines in test case. 109 * For expected output lines, everything before '*' is stripped out. 110 * Also lines containing comment start and comment end markers are 111 * ignored. 112 */ 113 snprintf(diff_cmd, sizeof(diff_cmd), 114 "awk '/START-EXPECTED-OUTPUT/{out=1;next} " 115 "/END-EXPECTED-OUTPUT/{out=0} " 116 "/\\/\\*|\\*\\//{next} " /* ignore comment start/end lines */ 117 "out {sub(/^[ \\t]*\\*/, \"\"); print}' '%s' | diff -u - '%s'", 118 test_file, out_file); 119 err = system(diff_cmd); 120 if (CHECK(err, "diff", 121 "differing test output, output=%s, err=%d, diff cmd:\n%s\n", 122 out_file, err, diff_cmd)) 123 goto done; 124 125 remove(out_file); 126 127 done: 128 btf__free(btf); 129 return err; 130 } 131 132 void test_btf_dump() { 133 int i; 134 135 for (i = 0; i < ARRAY_SIZE(btf_dump_test_cases); i++) { 136 struct btf_dump_test_case *t = &btf_dump_test_cases[i]; 137 138 if (!test__start_subtest(t->name)) 139 continue; 140 141 test_btf_dump_case(i, &btf_dump_test_cases[i]); 142 } 143 } 144